65200021 has 4 divisors (see below), whose sum is σ = 65279500. Its totient is φ = 65120544.

The previous prime is 65200019. The next prime is 65200061. The reversal of 65200021 is 12000256.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26635921 + 38564100 = 5161^2 + 6210^2 .

It is a cyclic number.

It is not a de Polignac number, because 65200021 - 2¹ = 65200019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 65199968 and 65200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65200061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38496 + ... + 40153.

It is an arithmetic number, because the mean of its divisors is an integer number (16319875).

Almost surely, 2^65200021 is an apocalyptic number.

It is an amenable number.

65200021 is a deficient number, since it is larger than the sum of its proper divisors (79479).

65200021 is an equidigital number, since it uses as much as digits as its factorization.

65200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79478.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 65200021 is about 8074.6529956401. The cubic root of 65200021 is about 402.4845789650.

Adding to 65200021 its reverse (12000256), we get a palindrome (77200277).

The spelling of 65200021 in words is "sixty-five million, two hundred thousand, twenty-one".